Thermistor Or Related Abnormality (Outdoor Unit) - Daikin MKS-T Series Service Manual

SiSG121917E

7.18 Thermistor or Related Abnormality (Outdoor Unit)

H9, J3, J6, J8, J9, P4
Error Code
Outdoor Unit LED
A j 1 i 2 i 3 h 4 h 5 h
Display
Method of Error This fault is identified based on the thermistor input voltage to the microcomputer.
Detection A thermistor fault is identified based on the temperature sensed by each thermistor.
Error Decision
 The voltage between the both ends of the thermistor is above 4.96 V or below 0.04 V with
Conditions
 J3 error is judged if the discharge pipe temperature is lower than the heat exchanger
 The system is shut down if all the units are judged as the J8 error.
Supposed
 Disconnection of the connector for the thermistor
Causes  Thermistor corresponding to the error code is defective.
 Defective heat exchanger thermistor in the case of J3 error
 Defective outdoor unit PCB
Troubleshooting
In case of P4
Replace the outdoor unit PCB (main PCB).
P4 : Radiation fin thermistor
Part 6 Service Diagnosis
the power on.
temperature.
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Troubleshooting for Outdoor Unit
162